Sewing machine attachment for sewing buttons



N 28, 1967 c. CURELLO ETAL 3 354 49 SEWING MACHINE ATTACHMENT FOR SEWINGBUTTONS Filed April 15, 1965 2 Sheets-Sheet 1 INVENTORS CHARLES CURELLOBASIL S. NICKERSON XMWM ATTORNEYS Nov. 28, 1967 c. c -L ETAL 3,354,849

SEWING MACHINE ATTACHMENT FOR SEWING BUTTONS Filed April 15, 1965 v 2Sheets-Sheet 2 FIGS INVENTORS ATTORNEYS I38 CHARLES CURELLO I BY BASILS. NICYKERSQN 4 3 136 W M M I United States Patent 3,354,849 SEWINGMACHINE ATTACHMENT FOR SEWING BUTTONS Charles Curello, East Haven, andBasil S. Nickerson,

North Haven, Conn., assignors to Mite Corporation,

New Haven, Conn., a corporation of Delaware Filed Apr. 15, 1965, Ser.No. 448,490 11 Claims. (Cl. 112-115) ABSTRACT OF THE DISCLOSURE Thesewing machine attachment is adapted to sew either two hole or four holebuttons. For the latter there is a cam and a cam follower for shiftingthe foot longitudinally to move from a first pair of holes to a secondpair of holes. The cam follower is moved out of the way by means of atwo-position selector lever when sewing a two-hole button, and there isdetent means to hold the selector lever in either the two-hole orfour-hole position. The attachment is driven by the usual yoke with pawland ratchet mechanism, and the ratchet wheel has a missing tooth to stopthe operation after the button has a predetermined number of stitches.There is a knob to turn the ratchet wheel past the missing tooth whenstarting another button.

This invention relates to sewing machine attachments for sewing buttons,and more particularly to an attachment for sewing either two hole orfour hole buttons.

Attachments for sewing buttons are already known. One such attachmentsecures a two hole button with a predetermined number of stitches, andhas been improved to take care of a four hole button by a manual shiftof the foot which holds the button. An attachment of this kind isdisclosed in Patent No. 2,735,387, issued Feb. 21, 1956.

The general object of the present invention is to imrove suchattachments. A more specific object is to provide an attachment in whichthe position of a four hole button is automatically shifted to changefrom the first pair of holes to the second pair. In accordance with afurther object this shift takes place after half the desired totalnumber of stitches have been made through the first pair of holes, theremaining stitches then being made through the second pair.

Still another object of the invention is to provide the attachment witha selector lever which makes it possible to sew either a two hole or afour hole button, with the same total number of stitches to hold thebutton. Other more detailed objects are to provide the selector leverwith detent means to hold it in either the two hole or the four holeposition, and with means to lock the position of the foot when sewing atwo hole button.

To accomplish the foregoing objects, and other objects which hereinaferappear, our invention resides in the attachment elements and theirrelation one to another, as are hereinafter more particularly describedin the following specification. The specification is accompanied bydrawings in which:

FIG. 1 is a plan view of a sewing machine attachment embodying featuresof our invention;

FIG. 2 is a front elevational view of the attachment;

FIG. 3 is a vertical section taken approximately in the plane of theline 33 of FIG. 2;

FIG. 4 is a plan view of the foot which receives the button;

FIG. 5 is a vertical section taken approximately on the line 5--5 ofFIG. 4;

FIG. 6 shows the shift cam and the transfer of its cam follower fromoperative to inoperative position;

FIG. 7 shows a detent carried by the selector lever;

FIG. 8 is an end view of the detent of FIG. 7;

Patented Nov. 28, 1967 FIG. 9 is a plan view of a guide on which a slidemoves to shift the position of the button; and

FIG. 10 is a front elevational view of the guide shown in FIG. 9.

Referring to the drawing, and more particularly to FIG. 2, the sewingmachine has the usual vertical presser bar 14, and needle bar 18carrying a sewing machine needle 20, the latter being secured in placeby a set screw 22. Referring to FIGS. 1 and 2, the sewing machineattachment comprises an adaptor 12 designed to be secured to the presserbar 14, and a fork 16 to engage the needle bar 18 of the sewing machinein order to drive the attachment. The fork 16 usually is designed tostraddle the screw 22, as shown.

The attachment further comprises a foot 24 to support a button, as shownat 26 in FIG. 5. There are appropriate means driven by oscillation ofthe fork 16 to cause zigzag sewing through two holes of a four holebutton. There is also a shift cam 30 shown in FIGS. 1, 3, and 6. Thisshifts the foot 24 longitudinally to change the stitching from the saidtwo holes to the other pair of holes, the four holes being arranged inconventional fashion at the corners of a A," square.

A selector lever is movable from the solid line position 32 shown inFIG. 2 to the broken line position 32', and this makes the shift caminoperative when sewing a two hole button.

Considering the arrangement in somewhat greater detail, a frame ofU-shape cross section is fixedly secured to the adaptor 12, the saidframe having sides 36 and 38 which are riveted to the rear or block-likeportion 70 of adaptor 12 by rivets 39 (FIG. 2). A cam shaft 40 and azig-zag cam 42 are rotatable in the frame. The shaft 40 is heldfrictionally by a resilient washer 43. The shaft 40 carries a ratchetwheel 44 which is mutilated by omission of a ratchet tooth. In theparticular case illustrated the ratchet wheel has eleven teeth at thespacing of twelve, the missing tooth being located at 46, and provideseleven zig-zag loops or stitches. The fork arm 16 pivots around the camshaft, and carries a pawl 48 engaging the ratchet wheel 44. The pawl isnormally urged toward the ratchet wheel 44 by resilient means, in thiscase a spring wire 50.

The foot 24 preferably has a serrated bottom, as indicated at 52 in FIG.2, so that the fabric moves with the foot and button. The conventionalfeed dogs of the sewing machine, not shown, are covered by a plate whenthe button sewing attachment is in use. The foot 24 has a button holdingspring 54 secured on top, as by means of rivets 56. Both the foot andthe spring are bifurcated to hold a button with its holes in an openspace beneath the needle of the sewing machine.

The shank 58 (FIG. 2) of foot 24 is longitudinally slidablc in a guideor yoke generally designated 68. One end of yoke 60 is turned down at 62and is slotted to receive shank 58. The other end might be turned downbut is here shown as a separate piece 64 which is fixedly secured toyoke 60 at 66. The parts 62 and 64 have slots which slidably receive theshank 58. The yoke is pivoted on a main pivot 68 which passes upwardlythrough the bottom of the U-shaped frame 36, 38. The rear end 71 of theyoke is additionally supported by a shouldered screw 72, the lower endof which is received in part 71, and the intermediate portion of whichpasses through a slot in a rearwardly projecting part 74 of the frame.The ends of the slot are visible at 76 in FIG. 1.

The yoke 60 carries an upright cylindrical cam follower best shown inFIG. 3. A rotatable roller part 80 is carried by a post 82 which isriveted at 84 on the yoke 60. The cam roller 80 is received in thebottom of the zigzag cam 42 previously referred to, and the cam may beconventional in construction.

In accordance with the present invention a cam follower 3 slide 86 ismounted on the frame and is coupled to the foot 24 for shifting the footlongitudinally in the yoke 60. More specifically, the slide has a finger88 which extends downward and then horizontally over the shank 58 of thefoot, as shown at 90 in FIG. 3. This receives a coupling screw 92, theupper end of which is threaded in part 90, and an intermediate part ofwhich is received in a short transverse slot best shown at 94 in FIG. 4,which slot accommodates the zig-zag oscillation of the foot.

The selector lever 32 is pivoted at 96 on the slide 86. It carries thecam follower 98 of the shift cam 30. The selector lever 32 when in thedown or solid line position shown in FIG. 2 moves the cam follower )8upward to operative position, as shown also in FIG. 6. However, when theselector lever is moved upward to the broken line position 32' in FIG.2, the cam follower 28 is moved downward to the broken line positionshown at 98 in FIG. 6, and then is out of the path of the cam 30, thusmaking the cam inoperative. The cam follower 98 may be riveted to theselector lever 32, and passes through an arcuate slot 100 (FIG. 2) inthe slide 86 in order to reach the shift earn 30.

The inner end of the pivot post 96 acts also as a second cam followerwhich causes return movement of the slide 86. The cam 30 has asubstantially constant diameter. The foot is always in rearward positionat the beginning of a sewing operation. The follower 96 is then atmaximum radius, and is not moved by the cam when sewing a two holebutton.

The selector lever 32 has additional means 102 to lock the slide 86against shifting when sewing a two hole button. More specifically, theselector lever has a somewhat heart shaped or two lobed opening (FIG. 2)through which the cam shaft 40 passes. The slide 86 has a horizontalslot 104 at the cam shaft 40 to permit the horizontal shift movement.The opening in the selector lever 32 has a lower lobe 106 whichaccommodates the shift movement, and an upper lobe 102 which fits aroundthe cam shaft 40 and acts as a locking or locating means to preventhorizontal shift of the selector lever and consequently of the slide 86and the foot 24, when the lever is raised to the position 32'.

The selector lever preferably has detent means to hold it dependably ineither up or down position. Referring to FIG. 2 the upper right cornerof slide 86 has two detent notches 108 and 119, and selector lever 32has a detent piece 112 urged toward the notches by a pull spring 114.The detent element 112 is shown separately in FIGS. 7 and 8, it having adetent protuberance 116, and a lug 118 excised outwardly, leaving aguide slot 119. Lug 118 has a hole 120 to receive one end of the pullspring, and reverting to FIG. 2, the lug 118 passes slidably through aslot 122. The other end of the pull spring 114 is connected to a postwhich is an extension of the pivot 96 previously referred to. Referringto FIG. 1 the detent 112 is held slidably on lever 32 by means of aheaded fastener 124 which passes through slot 119 (FIG. 7).

The end of cam shaft 40 carries a manually operable knob 126. This isshown in FIGS. 1 and 3 but is omitted in FIG. 2. It may be secured tothe cam shaft in any desired fashion, and in the present case has athreaded shank 128 which is screwed into a threaded hole in the shaft.The knob is turned slightly when beginning the stitching of a button, inorder to move the ratchet wheel 44 (FIG. 2) from the missing tooth at 46to the next tooth, thus making the device operative. After five stitchesthe cam 30 shifts the foot 24 and the button carried thereby to thesecond pair of holes in the button, and after eleven stitches themissing ratchet tooth is reached; the zig-zag motion stops; the operatorstops the sewing machine; but a continued stitch or two through one holelocks the thread.

Referring to FIGS. 2 and 3, the lower inwardly stepped part 130 of theslide 86 is horizontally slotted at 132, and is slidably guided on aspecial slide guide 134 secured to the frame by screws 136, the heads ofwhich serve also to hold the slide on the slide guide. The slide guideis shown separately in FIGS. 9 and 10. It comprises a base portion 138,and a stepped or reduced portion 134, the latter receiving the slot ofthe slide thereon. The slide guide has holes 140, and the shoulderedscrews 136 pass through the holes 14-0 into the frame, thereby servingto mount the slide guide on the frame, and also to hold the slide on theslide guide.

A button when slid into position on the foot 24 is nearly locatedbecause the foot is provided with a shallow depressed seat shown at 142in FIGS. 4 and 5. The seat is slightly elongated rather than circular,there being sides at 144 affording a slight adjustment as between a twohole button and a four hole button. The needle location is marked bymarks 146 (FIG. 1) on spring 54. The leaf spring 54 holds the button inthe seat 142. The adaptor 12 is made in different dimensions for usewith different makes of sewing machines, and results in the marks 146being located at the needle position.

It is believed that the construction and operation and method of usingour improved sewing machine attachment, as well as the advantagesthereof, will be apparent from the foregoing detailed description.

If the buttons being used are two hole buttons the selector lever israised; the button holes are properly located in alignment with themarks 146; the knob 126 is turned slightly; and the sewing machineoperated until the zig-zag motion stops. If the buttons being used arefour hole buttons the selector lever is moved to its down position; thebutton is first positioned rearward, that is, with the pair of holesnearer the operator in alignment with the marks 146. The knob is turnedslightly to make the pawl operative; the sewing machine is started andis continued as long as the zig-zag motion continues, whereupon themachine is stopped. During the zig-zag stitching the button isautomatically shifted from the forward pair of holes to the rearwardpair of holes, so that the stitches are divided between the two pairs ofholes. Machine inertia usually causes a stich or two through one hole,which helps lock the thread.

It will be understood that while we have shown and described ourinvention in preferred form, changes may be made in the structure shown,without departing from the scope of the invention, as sought to bedefined in the following claims.

We claim:

1. A sewing machine attachment for sewing two hole or four hole buttons,said attachment comprising an adaptor to be secured to the presser barof a sewing machine, a fork to engage the needle bar of the sewingmachine to drive the attachment, a foot to support a button, mechanismdriven by the fork to oscillate the foot for zigzag stitching throughtwo holes of the button, a shift cam driven by the fork to shift thefoot longitudinally to change the stitching from the said two holes tothe other two holes of a four hole button, a two-position selector leverarranged to make the shift cam inoperative when sewing a two holebutton, detent means to hold the said selector lever in either its twohole or four hole position as desired, and stop means operative on themechanism which oscillates the foot for zig-zag stitching causing saidmechanism to stop the oscillation after a predetermined number ofzig-zag stitches.

2. A sewing machine attachment for sewing four hole buttons, saidattachment comprising an adaptor to be secured to the presser bar of asewing machine, a frame carried by the adaptor, a cam shaft and azig-zag cam rotatable in said frame, a ratchet wheel on said cam shaft,a fork arm pivoted on said cam shaft for connection to the needle bar ofthe sewing machine, a pawl carried by said fork arm and engaging saidratchet wheel, a shift cam on said cam shaft, a foot having a serratedbottom and having a holding spring on top to hold a button beneath theneedle of the sewing machine, said foot having a narrow elongated shank,a yoke having slots in which the shank of said foot is longitudinallyslidable, means pivoting said yoke beneath the frame, a cam followercarried by said yoke and engaging said zig-Zag cam for oscillation ofthe foot, a cam follower slide mounted on said frame and coupled to saidfoot for shifting said foot longitudinally in said yoke, and a shift camfollower carried by said slide.

3. A sewing machine attachment for sewing four hole buttons, saidattachment comprising an adaptor to be secured to the presser bar of asewing machine, a frame carried by the adaptor, a cam shaft and aZig-zag cam rotatable in said frame, a ratchet wheel on said earn shaftmutilated by omission of a ratchet tooth, a fork arm pivoted on said camshaft for connection to the needle bar of the sewing machine, a pawlcarried by said fork arm and engaging said ratchet wheel, a shift cam onsaid cam shaft, afoot having a serrated bottom and having a holdingspring on top to hold a button beneath the needle of the sewing machine,a yoke in which said foot is longitudinally slidable, means pivotingsaid yoke beneath the frame, a cam follower carried by said yoke andengaging said zig-zag cam for oscillation of the foot, a cam followerslide mounted on said frame and coupled to said foot for shifting saidfoot longitudinally in said yoke, a shift cam follower carried by saidslide, and a manually operative knob on said cam shaft to advance thesame from its inoperable position with the pawl at the missing ratchettooth to bring the next ratchet tooth into operative position.

4. A sewing machine attachment for sewing two hole or four hole buttons,said attachment comprising an adaptor to be secured to the presser barof a sewing machine, a frame carried by the adaptor, a-cam shaft and azig-Zag cam rotatable in said frame, a ratchet wheel on said cam shaft,a fork arm pivoted on said cam shaft for connection to the needle bar ofthe sewing machine, a pawl carried by said fork arm and engaging saidratchet wheel, a shift cam on said cam shaft, a foot having means tohold a button beneath the needle of the sewing machine, said foot havinga narrow elongated shank, a yoke having slots in which the shank of saidfoot is longitudinally slidable, means pivoting said yoke beneath theframe, a cam follower carried by said yoke and engaging said zigzag camfor oscillation of the foot, a cam follower slide mounted on said frameand coupled to said foot for shifting said foot longitudinally in saidyoke, a two-position selector lever pivoted on said slide, and a shiftcam follower carried by said lever, said lever being movable between afour hole position in which the shift cam follower is operative and atwo hole position in which the shift cam follower is moved out of theway to make the shift cam inoperative, and detent means to hold theselector lever in either its two hole or four hole position as desired.

5. A sewing machine attachment for sewing two hole or four hole buttons,said attachment comprising an adaptor to be secured to the presser barof a sewing machine, a frame carried by the adaptor, a cam shaft and azigzag cam rotatable in said frame, a ratchet wheel on said cam shaft, afork arm pivoted on said cam shaft for connection to the needle bar ofthe sewing machine, a pawl carried by said fork arm and engaging saidratchet wheel, a shift cam on said cam shaft, a foot having means tohold a button beneath the needle of the sewing machine, said foot havinga narrow elongated shank, a yoke having slots in which the shank of saidfoot is longitudinally slidable, means pivoting said yoke beneath theframe, a cam follower carried by said yoke and engaging said zigzag camfor oscillation of the foot, a cam follower slide mounted on said frameand coupled to said foot for shifting said foot longitudinally in saidyoke, a twoposition selector lever pivoted on and movable with saidslide, and a shift cam follower carried by said lever, said lever beingmovable between a four hole position in which the shift cam follower isoperative and a two hole" position in which the shift cam follower ismoved out of the way to make the shift cam inoperative, said leverhaving a locating slot receiving a fixed shaft and made operative in thetwo hole position to prevent shift, and said lever having a clearanceslot which is transverse to the locating slot and which affords movementof the lever with the slide when the lever is in the four hole position.

6. A sewing machine attachment for sewing two hole or four hole buttons,said attachment comprising an adaptor to be secured to the presser barof a sewing machine, a frame carried by the adaptor, a cam shaft and azig-zag cam rotatable in said frame, a ratchet wheel on said cam shaft,a fork arm pivoted on said cam shaft for connection to the needle bar ofthe sewing machine, a pawl carried by said fork arm and engaging saidratchet wheel, a shift cam on said cam shaft, a foot having means tohold a button beneath the needle of the sewing machine, said foot havinga narrow elongated shank, a yoke having slots in which the shank of saidfoot is longitudinally slidable, means pivoting said yoke beneath theframe, a cam follower carried by said yoke and engaging said zig-zag camfor oscillation of the foot, a cam follower slide mounted on said frameand coupled to said foot for shifting said foot longitudinally in saidyoke, a twoposition selector lever pivoted on said slide, a shift camfollower carried by said lever, said lever being movable between a fourhole position in which the shift cam follower is operative and a twohole position in which the shift cam follower is moved out of the way tomake the shift cam inoperative, and detent means to hold the lever ineither the two hole or four hole position.

7. A sewing machine attachment for sewing two hole or four hole buttons,said attachment comprising an adaptor to be secured to the presser barof a sewing machine, a frame carried by the adaptor, a cam shaft and azig-zag cam rotatable in said frame, a ratchet wheel on said cam shaft,a fork arm pivoted on said cam shaft for connection to the needle bar ofthe sewing machine, a pawl carried by said fork arm and engaging saidratchet wheel, a shift cam on said cam shaft, a foot having means tohold a button beneath the needle of the sewing machine, said foot havinga narrow elongated shank, a yoke having slots in which the shank of saidfoot is longitudinally slidable, means pivoting said yoke beneath theframe, a cam follower carried by said yoke and engaging said zig-zag camfor oscillation of the foot, a cam follower slide mounted on said frameand coupled to said foot for shifting said foot longitudinally in saidyoke, a two-position selector lever pivoted on said slide, and a shiftcam follower carried by said lever, said lever being movable between afour hole position in which the shift cam follower is operative and atwo hole position in which the shift cam follower is moved out of theway to make the shift cam inoperative, said lever having a locating slotreceiving a fixed shaft and made operative in the two hole position toprevent shift, and said lever having a clearance slot which istransverse to the locating slot and which affords movement of the leverwith the slide when the lever is in the four hole position, and detentmeans to hold the lever in either the two hole or four hole position.

8. A sewing machine attachment for sewing two hole or four hole buttons,said attachment comprising an adaptor to be secured to the presser barof a sewing machine, a frame carried by the adaptor, a cam shaft and azig-zag cam rotatable in said frame, a ratchet wheel on said cam shaftmutilated by omission of a ratchet tooth, a fork arm pivoted on said camshaft for connection to the needle bar of the sewing machine, a pawlcarried by said fork arm and engaging said ratchet wheel, a shift cam onsaid cam shaft, a foot having a serrated bottom and having a holdingspring on top to hold a button beneath the needle of the sewing machine,a yoke in which said foot is longitudinally slidable, means pivotingsaid yoke beneath the frame, a cam follower carried by said yoke andengaging said zig-zag cam for oscillation of the foot, a cam followerslide mounted on said frame and coupled to said foot for shifting saidfoot longitudinally in said yoke, a selector lever pivoted on saidslide, a shift cam follower carried by said lever, said lever beingmovable between a four hole position in which the shift cam follower isoperative and a two hole position in which the shift cam follower ismoved out of the way to make the shift cam inoperative, and a manuallyoperable knob on said cam shaft to advance the same from its inoperativeposition with the pawl at the missing ratchet tooth to bring the nextratchet tooth into operative position.

9. A sewing machine attachment for sewing two hole or four hole buttons,said attachment comprising an adaptor to be secured to the presser barof a sewing machine, a frame carried by the adaptor, a cam shaft and azig-zag cam rotatable in said frame, a ratchet wheel on said cam shaftmutilated by omission of a ratchet tooth, a fork arm pivoted on said camshaft for connection to the needle bar of the sewing machine, a pawlcarried by said fork arm and engaging said ratchet wheel, a shift cam onsaid cam shaft, a foot having a serrated bottom and having a holdingspring on top to hold a button beneath the needle of the sewing machine,a yoke in which said foot is longitudinally slidable, means pivotingsaid yoke beneath the frame, a cam follower carried by said yoke andengaging said zig-zag cam for oscillation of the foot, a cam followerslide mounted on said frame and coupled to said foot for shifting saidfoot longitudinally in said yoke, a selector lever pivoted on saidslide, a shift cam follower carried by said lever, said lever beingmovable between a four hole position in which the shift cam follower isoperative and a two hole position in which the shift cam follower ismoved out of the way to make the shift cam inoperative, said leverhaving a locating slot made operative in the two hole position toprevent shift, and a manually operable knob on said cam shaft to advancethe same from its inoperative position with the pawl at the missingratchet tooth to bring the next ratchet tooth into operative position.

10. A sewing machine attachment for sewing two hole or four holebuttons, said attachment comprising an adaptor to be secured to thepresser bar of a sewing machine, a frame carried by the adaptor, a camshaft and a zig-zag cam rotatable in said frame, a ratchet wheel on saidcam shaft mutilated by omission of a ratchet tooth, a fork arm pivotedon said cam shaft for connection to the needle bar of the sewingmachine, a pawl carried by said fork arm and engaging said ratchetwheel, a shift cam on said cam shaft, a foot having a serrated bottomand having a holding spring on top to hold a button beneath the needleof the sewing machine, a yoke in which said foot is longitudinallyslidable, means pivoting said yoke beneath the frame, a cam followercarried by said yoke and engaging said zig-zag cam for oscillation ofthe foot, a cam follower slide mounted on said frame and coupled to saidfoot for shifting said foot longitudinally in said yoke, a selectorlever pivoted on said slide, a shift cam follower carried by said lever,said lever being movable between a four hole position in which the shiftcam follower is operative and a two hole position in which the shift camfollower is moved out of the way to make the shift cam inoperative,detent means to hold the lever in either the two hole or four holeposition, and a manually operable knob on said cam shaft to advance thesame from its inoperative position with the pawl at the missing ratchettooth to bring the next ratchet tooth into operative position.

11. A sewing machine attachment for sewing two hole or four holebuttons, said attachment comprising an adaptor to be secured to thepresser bar of a sewing machine, a frame carried by the adaptor, a camshaft and a zig-zag cam rotatable in said frame, a ratchet wheel on saidcam shaft mutilated by omission of a ratchet tooth, a fork arm pivotedon said cam shaft for connection to the needle bar of the sewingmachine, a pawl carried by said fork arm and engaging said ratchetwheel, a shift cam on said cam shaft, a foot having a serrated bottomand having a holding spring on top to hold a button beneath the needleof the sewing machine, a yoke in which said foot is longitudinallyslidable, means pivoting said yoke beneath the frame, a cam followercarried by said yoke and engaging said zig-zag cam for oscillation ofthe foot, a cam follower slide mounted on said frame and coupled to saidfoot for shifting said foot longitudinally in said yoke, a selectorlever pivoted on said slide, a shift cam follower carried by said lever,said lever being movable between a four hole position in which the shiftcam follower is operative and a two hole position in which the shift camfollower is moved out of the way to make the shift cam inoperative, saidlever having a locating slot made operative in the two hole position toprevent shift, detent means to hold the lever in either the two hole orfour hole position, and a manually operable knob on said cam shaft toadvance the same from its inoperative position with the pawl at themissing ratchet tooth to bring the next ratchet tooth into operativeposition.

References Cited UNITED STATES PATENTS 2,158,171 5/1939 Avis 1121l02,549,920 4/1951 Mosberg 112-115 2,735,387 2/1956 Baehr et al 1121152,890,668 6/1959 Johnson et al. ll277 3,098,459 7/1963 Bono 112-114JORDAN FRANKLIN, Primary Examiner.

G. V. LARKIN, Assistant Examiner.

1. A SEWING MACHINE ATTACHMENT FOR SEWING TWO HOLE OR FOUR HOLE BUTTONS,SAID ATTACHMENT COMPRISING AN ADAPTOR TO BE SECURED TO THE PRESSER BAROF A SEWING MACHINE, A FORK TO ENGAGE THE NEEDLE BAR OF THE SEWINGMACHINE TO DRIVE THE ATTACHMENT, A FOOT TO SUPPORT A BUTTON, MECHANISMDRIVEN BY THE FORK TO OSCILLATE THE FOOT FOR ZIG-ZAG STITCHING THROUGHTWO HOLES OF THE BUTTON, A SHIFT CAM DRIVEN BY THE FORK TO SHIFT THEFOOT LONGITUDINALLY TO CHANGE THE STITCHING FROM THE SAID TWO HOLES TOTHE OTHER TWO HOLES OF A FOUR HOLE BUTTON, A TWO-POSITION SELECTOR LEVERARRANGED TO MAKE THE SHIFT CAN INOPERATIVE WHEN SEWING A TWO HOLEBUTTON, DETENT MEANS TO HOLD THE SAID SELECTOR LEVER IN EITHER ITS TWOHOLE OR FOUR HOLE POSITION AS DESIRED,